Abstract
The behavior of blood during its flow in human arteries has always been a subject of keen interest. Flow parameters such as pressure, velocity and wall shear stress vary with changes mainly in the geometry of the artery. The work focusses on the variation of wall shear stress along the walls of an Idealized Carotid Artery. Simulations are carried out for both Newtonian and Non-Newtonian behavior of blood. In the Non-Newtonian flow, Carreau-Yasoda model is chosen for the calculations. Steady flow and Transient flow cases are also analyzed where the User Defined Function is interpreted for further calculations. It is observed that recirculation of flow occurs at a critical area in the geometry. The results obtained are compared with the numerical results of Eleyas Shaik. The Wall Shear Stress plots are found to be in close correspondence to those in the thesis.
Highlights
The Carotid artery plays a significantly crucial role in the cardiovascular system of the human body
Hemodynamics of the Carotid artery gives us a better idea about the nature of the blood flowing through the artery and about the challenges faced during the flow in different locations inside the artery
In case of pulsatile flow, following changes are made before starting the calculations: 1) The necessary User Defined Function (UDF) for inlet velocity is interpreted 2) The inlet boundary condition from a constant value to the waveform generated from the User defined functions (UDF). 3) Number of time steps and number of iterations per time step are specified keeping in mind the total cycle time (1 second)
Summary
The Carotid artery plays a significantly crucial role in the cardiovascular system of the human body. The important function of blood flow to the face, neck and the brain of the human body is performed by the Carotid artery [1]. Each Carotid Artery bifurcates into 2 divisions, namely the Internal Carotid Artery(ICA) and the External Carotid Artery(ECA). The ICA supplies blood to the brain while the ECA supplies blood to the face and the neck [1]. Hemodynamics of the Carotid artery gives us a better idea about the nature of the blood flowing through the artery and about the challenges faced during the flow in different locations inside the artery. Wall Shear Stress(WSS) is a major factor in analyzing the blood flow characteristics inside the artery [1]
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